Non-pressure gradient single cycle CVI/CVD apparatus and method

Details Non-pressure gradient single cycle CVI/CVD apparatus and method Non-pressure gradient single cycle CVI/CVD apparatus and method

2008-07-07

2011-11-15

Meeks, Timothy (Department: 1715)

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

C427S249100, C427S255120

Reexamination Certificate

active

08057855

ABSTRACT:
A process for densifying porous structures inside a furnace using non-pressure gradient CVI/CVD includes disposing a number of porous structures in a stack within a furnace. The stack has a center opening region extending through the porous structures and an outer region extending along the outside of the porous structures. Channels provide fluid communication between the center opening region and the outer region. A first portion of a gas composition is introduced to the center opening region. A second portion of the gas composition is introduced to the outer region. The porous structures are densified from an average density of less than 0.60 g/cm3to an average density of greater than 1.70 g/cm3in a single cycle of non-pressure gradient CVI/CVD.

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